Explanation:ocanic crust is the first one both is the 2nd one and contenetal crust is 3rd one
Answer: A
Explanation:
Reproductive cells are haploid, meaning that there's only one copy of each chromosome. Somatic cells are diploid so there's 2 copies of each chromosomes.
if n = 18, then 2n = 36 so A is the answer
The correct option is D.
Endosymbiosis theory postulates that eukaryotic cells evolved from prokaryotic cells. Scientists have discovered that there are many similarities between prokaryotic cells and the organelles in eukaryotic cells.
Primary consumers (such as grazers and browsers) of the biological community will put pressure on the primary producers (these are plants) since the primary producers have limited resources (water) to reproduce due to the drought. The primary producers hence become scarce and cause the primary consumers to compete for limited resources. This causes the primary producers to reduce in population. Reduction in their population causes limited resources for secondary consumers and this cascades up the food web to tertiary consumers.
Answer:
Because heat is lost from the surface of the body, small mammals lose a greater proportion of their body heat than large mammals. Mammals conserve body heat with their hair or fur. It traps a layer of warm air next to the skin. ... Mammals also have a layer of fat under the skin to help insulate the body.