Which one of the following criteria is necessary for natural selection to occur? A. Individuals show no variation in fitness levels.B. Individuals have the same adaptations.C. Enough resources exist for individuals to survive and thrive.D. A struggle for existence is apparent.
How do passive transport and active transport differ? Is osmosis an example of passive transport or active transport? Why?
Which statement describes decomposers?. . . . A.Decomposers are those organisms that recycle matter in the ecosystem.. . . . B.Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems.. . . C. Decomposers can produce their own source of energy and can sometimes act as primary producers. .
Which of the following statements about the tundra is not true? a. Tundra means “treeless land.” b. Plants and animals in the tundra have adapted to the extreme climate. c. Temperatures in the tundra range from extreme highs to extreme lows. d. The alpine tundra can be found on mountaintops.
Humans add greatly to the carbon cycle by A. driving cars B. planting trees C. conserving energy D. using solar power
Which best illustrates the result of the process of meiosis? A pea plant has the same flower color as its parent plants. A daughter looks different from both her mother and her father. A cheetah cub has very similar fur to its mother. A Labrador puppy looks exactly like its father.
Solid fats have a high proportion of _____. glycerol saturated fatty acids unsaturated fatty acids fish and vegetable oils
Which of the following is used as evidence in supporting the idea that life changes over time? A. the time period in which an embryo develops B. the similarities in the body systems such as the nervous and circulatory systems C. the existence of homologous structure D. the big bang theory
What is the structure and function of a pseudopod? it sticks out like a foot and helps with movement. it beats liquid like a whip and helps with movement. it looks like a hair and sweeps food into a mouth-like opening. it contains membranes that carry out photosynthesis?
Which enzymes are secreted only by the pancreas? nucleases amylase and proteases lipases amylase, proteases, lipases, nucleases
Whales have what seem like remnants of a pelvis and femur, as shown here. What are these structures an example of?
Which hormone is responsible for regulating the sleep cycle in your body? Select one of the options below as your answer: A. Melanotropin B. Melatonin C. Adrenaline
The product of the p53 gene _____. the product of the p53 gene _____. slows down the rate of dna replication by interfering with the binding of dna polymerase
Which scientist proposed a link between contaminated water and cholera A.Pasteur B. curie C. salk D.koch
Genetic drift tends to occur in populations that (1 point)are very large. are small. are formed from new species. have unchanging allele frequencies
Which experiment should be conducted as a field investigation? observing changes in the nesting behavior of wood ducks measuring the fermentation rate of yeast in salt water determining the germination rate of a new soybean hybrid investigating gene expression in fruit fly offspring
Which of the following is the biggest threat to the Monarch butterflies’ annual migration? a. illegal logging c. airplanes b. cold winters d. new predators
Why do naturalists suggest that we plant more trees? Plants use CO2 but do not release any, thus maintaining a balance of CO2 in the atomsphere. Plants release CO2 through respiration and use it for photosynthesis, thus decreasing the amount of CO2 and maintaining its balance in the atmosphere. Plants do not use any CO2, thus maintaining low levels of CO2 and balancing its level in the atmosphere.
Biochemistry is the study of _____. energy and matter within living organisms energy and matter of earth energy and chemicals chemical reactions and bonds
Scientific evidence is most likely to be consistent if it is based on data from A) random samples B) uncontrolled experiments C) biased experimental designs D) small data samples
1.which of the following is NOT a major component of soil A.mineral matter B.air C.humus D.earthworms 2.a soils texture is determined by ___ A.mineral composition B.type of humus C.water content D.particle size 3.the main source of organic matter in soil is A.water B.plant C.fungi D.bacteria
Which object reflects light with the longest wavelength? a yellow book a violet flower a blue paper a green leaf
Poor measurement practices are likely to lead to data that are ________. A. calibrated B. inconsistent C. minimal D. scientific
Which statement could be categorized only in the anaerobic section of the Venn diagram? a. is performed by eukaryotes b. has commercial uses c. regenerates NADH d. occurs in the mitochondria
HELP The complement system is a______ barrier of the immune system. A complement system is a group of _____ in the blood that detect pathogens that have entered the body. The complement system can cause _______, the swelling of a part of the body accompanied by redness, swelling, and pain as a response to infection.
Natural pollution includes _____. Pesticides Falling leaves Disposable products Smog is not the answer Give the science behind your answer