The number of trophic levels in an ecological energy pyramid

a. is limited by the amount of energy lost at each trophic level

b. is impossible to figure out

c. is limitless

d. never exceeds three

What type of cell is a stomach cell

Which statement about matter is true? Matter is anything that is made of atoms and that has mass. Matter is anything that is made of organic substances and is found on the earth. Matter is an element. Matter is a compound.

When we are born, we have about how many brain cells?

Which of the following is an example of post-transcriptional control of gene expression? a. gene amplification contributing to cancerb. the removal of introns and alternative splicing of exonsc.

A boat moves up and down as water waves pass under the boat. If the amplitude of the wave gets bigger, then A) the boat will rise up higher. B) the boat will not rise up as high. C) the boat will go up and down more often.

Which is the mechanism by which improper excision of a prophage from a bacterial chromosome results in packaging of bacterial genes near the integration site into a phage head?

The tundra biome has extremely cold temperatures during much of the year and a hard sublayer of permanently frozen soil called permafrost. Which of the following adaptations would plants in the tundra most likely have? A.

When plants of a particular species are growing too close to each other, crowding may eventually lead to mortality, known as self-thinning. this type of mortality is density-dependent. oscillating. exponential. density-independent. random?

the plant can either have a dominant allele or a recessive allele what would be a reason that is not a hardy weinberg equilibrium

What does DNA not contain?